# 导包取别名
import package.module1 as m
from package.module1 import PI
from package.module1 import *

print(m.PI)
print(PI)
print(sum(1, 2))

# 导包的本质时将代码复制当前的代码中执行一遍

import sys

# python环境变量
for path in sys.path:
    print(path)
